| 极震区黄土微结构的试验研究 |
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| 引用本文： | 李兰,王兰民,刘旭.极震区黄土微结构的试验研究[J].中国地震,2005,21(3):369-377. |
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| 作者姓名： | 李兰 王兰民 刘旭 |
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| 作者单位： | 中国地震局兰州地震研究所,兰州市东岗西路450号,730000 |
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| 基金项目： | 国家自然科学基金项目（50379049）;中国地震局兰州地震研究所论著编号：LC20050019. |
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| 摘 要： | 本文以1995年甘肃省境内5．8级地震引起的黄土地区震陷灾害实例，对黄土微结构孔隙性进行了定量研究。通过电镜扫描手段和SEM图像处理技术，对极震区震陷性黄土微观结构的各项指标进行了比较分析，得出不同地点的黄土孔隙分布曲线；对极震区受地震破坏和未受破坏典型架空孔隙结构的黄土进行了定量处理，较好地解释了土体的工程性质，结合激光粒度分析仪对极震区黄土进行了测量和统计分析。同时对无震区与强震区黄土孔隙分布曲线进行了对比研究。结果表明：不同极震区的孔隙分布特征不同，同一深度不同区域孔隙分布曲线亦有明显的差异。
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| 关 键 词： | 地震灾区 黄土微结构 图像处理 定量分析 |
| 文章编号： | 1001-4683（2005）03-00-00 |
| 收稿时间： | 2004-09-24 |
| 修稿时间： | 2004-09-242005-04-27 |
Research on Loess Micro-structure in the Magistoseismic Area |
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| Li Lan,Wang Lanmin,Liu Xu.Research on Loess Micro-structure in the Magistoseismic Area[J].Earthquake Research in China,2005,21(3):369-377. |
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| Authors: | Li Lan Wang Lanmin Liu Xu |
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| Institution: | Lanzhou Base of Institute of Earthquake Science, CEA, Lanzhou 730000, China |
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| Abstract: | In order to give loess micro-structure quantitative analysis, many cases of seismic subsidence disaster in the 1995 Yongdeng Ms 5. 8 earthquake are discussed. Using scanning electronic microscope, the SEM image manipulation technique, comparison on each factor of loess micro-structure of seismic subsidence in the magistoseidmic area, curves of pore distribution of loess in different site are obtained; Loess with trellis structure pores in intense seismic area compared with that of nonseismic area, this quantitative analysis explain the loess engineering feature well. The measure and statistic on Laser-granularity analysis of loess are assoeiatively done in the study. Then the curves of pore distribution in intense seismic area compared with that of non-seismic area. The result shows that the character of pore distribution in different magistoseismic areas is different; and there are many differences in the same deepness curves of pore distribution in different sites. |
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| Keywords: | Seismic disaster area Loess micro-structure Image manipulation Quantities analysis |
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